Balanced slide-valve



(No Model.)

2 Sheets-Sheet 1. D. H. BROWN. BALANGED SLIDE VALVE.

Patented Mar. 5, 1895i.

2 Sheets-Sheet 2.

D.- H. BROWN'. BALANGED SLIDE VALVE. No. 535,159. r Patented Mar. 5,1895.

lllNrTnn STATES PATENT @strom DANIEL H. BROWN, OF MCCOMB, MISSISSIPPI.

BALANCED SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 535,159, dated March 5,1 895..

Application filed October 30. 1894. Serial No. 527,409. (No model.)

To all whom it may concern.:

Be it known that I, DANIEL 1-1. BROWN, a citizen of the United States,residing at lllc- Oomb, in the county of Pike, State of Mississippi,have invented certain new and useful Improvements in BalancedSlide-Valves, of which the following is a specification, reference beinghad therein to the accompanying drawings.

This invention relates to certain new and useful improvements in slidevalves and it has for its object among others to so construct the valveand valve chest as to dispense with the necessity of a packing or stufngbox. To accomplish this I provide a double steam chest or a steam chestdivided by a horizontal partition or diaphragm, the Valve being also ofnovel construction and having an extension working through a slot oropening in the said partition or diaphragm and connected with the valvestem which works in the upper portion of the steam chest.

Other objects and advantages of the invention will hereinafter appearand the novel features thereof will be specically defined by theappended claims.

The invention is clearly illustrated in the accompanying drawings,which, with the letters of reference marked thereon, form a part of thisspecification, and in which- Figure 1 is a vertical section through thevalve and steam chest in the direction of movement of the valve. Fig. 2is a vertical section taken at right angles to that of Fig. l-on theline 2-2 of Fig. l. Fig. 3 is a horizontal section on the line 3-3 ofFig. 1, looking in the direction of the arrows. Fig. 4. is a plan viewof the valve with a portion of the same broken away.

Like letters of reference indicate like parts throughout the severalviews.

Referring now to the details of the drawings by letter, A designates aportion of the cylinder having the usual steam passages as indicated bydotted lines in Fig. l; or it may be the base-piece upon which the steamchest is supported.

B is the steam chest mounted upon the part A in the usual or any desiredmanner; in this instance being shown as secured in position by bolts bwhich engage threaded openings in the part A and pass through lugs or aliange The steam chest is divided into two chambers or compartments bythe horizontalwall or partition O which is provided centrally with arectangular opening C as shown best in Fig. 3. The balanced slide valveworks in the lower of these compartments and the Valve stem in the upperone, the valve having a vertical extension working through the openingin the diaphragm or partition to connect with the said stem as seen bestin Fig. 1. D is the vertical extension and D is the valve stem connectedtherewith in any suitable manner and working through an opening in athickened portion d of the wall of the steam chest near the upper endthereof as seen in Figs. 1 and 3.

E is the balanced slide valve. It has the chamber F. upon its under faceand from the same projects centrally the vertical extension D abovedescribed. This valve is formed with the circular recess or chamber eand the neck c of the valve is formed with an annular groove e2 in whichis fitted a plurality of split expansion rings F as shown in Figs. 1 and2.

G is an annular friction plate fitted Within the chamber e as shown,having a surrounding flange g which rests upon the top face of the valveas seen best in Fig. 2 and the upper face of this friction plate isformed with arc-shaped channels g as seen in Figs. 1, 2 and 4, while theouter periphery of the said plate is formed with an Vannular groove h inwhich is located a split expansion ring H as shown in Figs. 1 and 2.

The under face of the friction plate or disk or ring is formed with anannular or substantially circular inclined groove I in which is locateda splint ring J as shown in Figs. 1 and 2. This ring serves to seat themain ring or friction plate G.

It will be seen that from the construction above described no packingfor the valve stem is necessary and the cover to the steam chest mayeven be omitted in some cases. The valve reciprocates in the usualmanner over the ports of the cylinder and the stem being in anindependent chamber there is no IOO leakage. The expansion rings keepthe friction plate or main ring properly seated and prevent leakagetherearound.

Modifications in detail may be resorted to without departing from thespirit of the invention or sacrificing any of its advantages. Theopening in the top of the steam chest may loe circular as indicated bydotted lines in Fig. 3 instead of square as shown in full lines. In thiscase no steam chest cover will be necessary and I can use simply a roundlid or cap. So also the flange or lug h at the lower edge of the steamchest may be dispensed with and the lug provided at the upper edge asindicated by dotted lines in Fig. 2.

What I claim as new is- 1. A slide Valve comprising a body portion withannular chamber, neck portion andvertical extension, a friction ringfitted in said chamber and having an inclined annular groove upon itsunder face, and a split ring in said groove, substantially as specified.

2. A slide valve comprising a body portion with annular groove and neckhaving peripheral groove, split ringsin said annulargroove, a frictionring with peripheral groove and annular inclined groove upon its underface, split ring in the peripheral groove of said ring, and a split ringin the groove on the under face of the friction ring for seating thelatter, as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

DANIEL H. BROWN.

Witnesses:

CHARLES R. SMITH, P. J. SoMERs.

